chemical reagents their purity and tests by E. Merck, Henry Schenk

By E. Merck, Henry Schenk

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The distillate must be tested with ammonium molybdate solution for phosphoric acid.. 28 CHEMICAL REAGENTS drops of decinormal potassium permanganate solution to a mixture of 5 cc. of phosphoric acid and 5 cc. of diluted sulphuric acid, and then heating for five minutes at 100° C , the red color of the liquid should not disappear. Arsenic. — A Marsh apparatus is started using 20 gm. of arsenic-free, granulated zinc, and diluted (1:5) sulphuric acid. A mixture of 3 cc. of phosphoric acid with 20 cc.

TESTS OF PURITY The tests to be made are those given under Acid Phosphoric sp. gr. 7. But for 1 cc. of the phosphoric acid sp. gr. 7, use 4 cc. of the phosphoric acid sp. gr. 12. * Methyl orange may be used instead of phenolphthalein. In this case, however, 1 cc. 09802 gm. of H

5 part of boiling, water. The aqueous solution is slightly alkaline to litmus paper.

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